// JavaScript Document
//固定广告
$(this).scroll(function() { 
	var bodyTop = 0; 
	if (typeof window.pageYOffset != 'undefined'){ 
		bodyTop = window.pageYOffset; 
	}else if(typeof document.compatMode != 'undefined' && document.compatMode != 'BackCompat'){ 
		bodyTop = document.documentElement.scrollTop; 
	}else if (typeof document.body != 'undefined'){ 
		bodyTop = document.body.scrollTop; 
	} 
	$("#Piao_L,#Piao_R").css("top", 200 + bodyTop); 
}); 

//固定菜单
var nt = !1;
			$(window).bind("scroll",
				function() {
				var st = $(document).scrollTop();//往下滚的高度
				nt = nt ? nt: $("#nav_l").offset().top;
				// document.title=st;
				var sel=$("#nav_l");
				if (nt < st) {
					sel.addClass("nav_fixed");
					$(".dropMenu").css("margin-top","30px");
				} else {
					sel.removeClass("nav_fixed");
					$(".dropMenu").removeAttr("margin-top");
					$(".dropMenu").css("margin-top","153px");
				}
			});